Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hiroshi Kanno

Masataka Ota

Hiroshi Usami

Yasuhiko Nagata

Katsunori Yamashita

Generally, the current threshold value is set as a fixed value. Therefore, even in a case where an abnormality occurs in the load and the resistance value is small, when the power supply voltage applied to the load is low, the current value is also low, and falls below the threshold value, and there is a possibility that the overcurrent is not detected. In the present invention, by providing a second detection means that detects a load abnormality by calculating the resistance value of the load from information of the power supply voltage applied to the load, in addition to a first detection means that detects an overcurrent state that indicates the load abnormality using only current value information, it is possible to detect an overcurrent indicating an abnormality of the load even when the power supply voltage applied to the load is low.

Automotive electronic control unit

Provided is an electric control unit which is configured to switch the functions of an LCC, an HSD, and an LSD depending on a load to be connected. A power-supply-side switching elementis provided in a path Lbetween a power supplyand a connector terminal. A ground-side switching elementis provided in a path Lbetween a groundand a connector terminal. A freewheeling diodeis provided in a path Lconnected to a connection point Pbetween the power-supply-side switching elementand the connector terminaland a connection point Pbetween the ground-side switching elementand the connector terminal. A switching elementis provided in the path L

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Hitachinaka, Japan

Hiroshi Kanno